Underlayment and Backerboard Installation Instructions

Underlayment and Backerboard Installation Instructions
Allura Fiber Cement Underlayment
General Information
Storage and Handling
Approved Mortars
Keep fiber cement products clean and protect them from
direct exposure to the weather. They must be stored on a
smooth, flat surface, not directly on the ground. Moisturesaturated fiber cement must not be installed. If saturated,
let it dry before installation.
•Setting Backer—Standard dryset or latex/acrylic
modified thinset.
•Setting Tile—Latex/acrylic modified thinset or mastic.
Joint Tape
Use 2” wide, alkali resistant, fiberglass reinforcing tape.
Fasteners
Allura recommends hot-dipped galvanized roofing nails,
dimensioned according to installations below. Vertical
applications must allow for a 1-1/2” framing member
penetration. Floor applications must allow for full
penetration of the subfloor material depth.
Cutting
Always wear approved safety glasses, hearing protection
and a dust mask while cutting cement or wood-based
products. Cutting methods include:
•Score and Snap—Score the face deeply (with a
carbide tipped scoring tool) and snap upward against
a straight edge. (For small holes, score the perimeter
of the opening desired and knock out with a hammer.)
• Shears—Use electric or pneumatic shears made for
fiber cement material.
• Circular Saw—Use a circular saw with a fiber cement
PCD blade.
Safety
Fiber cement products should be cut in open, well-ventilated
areas. When cutting fiber cement products with a power
saw, workers must wear dust masks. If it is necessary to
cut these products indoors or in a poorly ventilated area,
you must use a NIOSH/MSHA-approved ventilator with a
HEPA filter cartridge-equipped respirator. Ear protection
and safety glasses are also required.
2
Floors
Subfloor
Make certain that the subfloor is structurally sound and that
deflection in any plane will not exceed L/360. Make sure the
subfloor is clean and flat. The framing must comply with the
UBC (Uniform Building Code), all local building codes and
ANSI 108.11.
•New Construction—Use a minimum of 3/4” plywood
over a maximum joist spacing of 16” o.c.
•Remodeling—Remove all existing floor coverings prior
to installation of Allura underlayment and replace any
loose, damaged or warped boards. Use wood screws
to tighten subfloor to joists where necessary.
Layout
Stagger all joints, length and width. Do not align with
plywood joints. Do not allow four corners at any point
to meet. Leave 1/4” gaps at walls and cabinet bases for
expansion joints. Do not fill these with mortar. In wet
areas, a moisture barrier must be used to protect framing
from moisture pass-through.
Fastening
Always use high quality, corrosion-resistant fasteners.
Apply a minimum of 3/32” thick dryset to subfloor (modified
thinset may be substituted), and seat board to embed it
evenly into the mortar. Leave 1/8” gaps between board
edges. Fasten 8” o.c. over the entire surface using (minimum)
1-1/2” hot-dipped galvanized roofing nails. Set the nail heads
flush with the surface of the board — do not overdrive. Keep
fasteners a minimum of 3/8” from panel edges and 2” in from
all corners.
Underlayment and Backerboard Installation Instructions
Countertop Installations
Finishing with Tile
Cabinets
Joint Preparation
Shall be level and secured. A minimum of 1/2” plywood shall
be securely fastened across the cabinet (more may be used
to achieve desired counter height). Support spacing shall not
exceed 16” o.c
Joints should be filled (except where corners meet — i.e.,
floor-wall, wall-ceiling, inside/outside corners) with the
same mortar used to set the tile. Bed the 2” wide (minimum)
alkali-resistant fiberglass tape into the wet mortar and level.
Layout
Ceramic Tile
A single sheet should be used to span across (front to back)
the cabinet span. Do not align the joints with plywood. All ends
and edges of the board should be fully supported by framing
members. In the area around the sink, a moisture barrier, such
as 4 mil polyethylene, is recommended to protect framing from
moisture pass-through.
Should meet the ANSI A137.1 strength standards.
Fastening
Apply a minimum of 3/32” thick dryset or modified thinset to
the plywood and seat board to embed it evenly into the mortar.
Leave 1/8” gaps between board edges. Fasten 8” o.c. over the
entire surface using (minimum) 1” hot-dipped galvanized roofing
nails. Set the nail heads flush with the surface of the board — do
not overdrive. Keep fasteners a minimum of 3/8” from panel
edges and 2” in from all corners.
Wall Installations
Framing
Ensure the framing is sound. Walls should be plumb to within
1/32” in 8’ (use shims to correct). The framing must comply with
the UBC (Uniform Building Code), all local building codes and
ANSI 108.11. Framing members shall be a minimum of 2x4
nominal wood or 20 gauge metal studs. They must be straight,
evenly aligned and spaced a maximum of 16” o.c. All corner
framing in tub and shower enclosures must be braced.
Layout
In wet areas, a moisture barrier, such as 4 mil polyethylene,
must be used to protect framing from moisture pass-through.
All panel edges must have full perimeter edge support on
framing members. All horizontal and vertical edges shall
maintain a minimum of 1/8” gap. Boards may be used
horizontally or vertically. Do not allow four panel corners to
meet at any point. Pop-outs can be easily made using the
score and snap method. To achieve equal appearances when
abutting to 1/2” drywall, use either 1/2” backerboard or 1/4”
furring strips nailed to each stud. Expansion joints shall be used
at all inside and outside corners, as well as every 12’ of wall.
Tile Setting
We recommend the use of acrylic modified thinset for
setting of ceramic tile. Follow all mortar and tile
manufacturer’s written installation instructions, ANSI
108.4 and 108.5 standards. Wipe/mop surface with a wet
cloth to remove any solid dirt and dust accumulated on the
board immediately preceding tile mortar. Spread the mortar
with the manufacturer-recommended notched trowel fitting
the application (minimum 1/4” notch). Thinset should be
troweled in one direction (not swirled) and tiles should be
placed, twisted and pressed into wet mortar.
Grouting
A minimum of 24 hours curing time should be allowed
before grouting and/or walking on the installed tiles.
Product Information
Basic Composition
The products are manufactured using a multi-step highpressure process combining cement, fly ash and wood fiber.
Specifications
Thickness (nominal)
Underlayment: 1/4” Backerboard: 1/2”
Weight
Underlayment 3’ x 5’ 28 lbs/piece 4’ x 4’ 30 lbs/piece
4’ x 8’ 60 lbs/piece
Backerboard
3’ x 5’ 49 lbs/piece
Pieces/Unit
Underlayment Backerboard
3’ x 5’ 85 pieces/unit 3’ x 5’ 50 pieces/unit
4’ x 4’ 85 pieces/unit
4’ x 8’ 50 pieces/unit
SKU Numbers
10200/000 10201/000 10202/000 10203/000 Product Testing
Complies with ASTM C1288 and ASTM C1185
Tested to ANSI 118.9
3’ x 5’ x 1/4”
3’ x 5’ x 1/2”
4’ x 4’ x 1/4”
4’ x 8’ x 1/4”
Flame Spread/Smoke Development
ASTM E84 Test Results Flame Spread: 0
Smoke Development: 5
Shear Bond Strength
Latex-Portland Cement Greater than 280 psi
3
Allura’s premier fiber cement products by Plycem USA offer an extremely durable, weather-resistant
collection that features superior aesthetics for a wide range of construction projects. Since Plycem is known
for its advanced technology, the construction community can rely on Allura for an easier installation system
that saves time and money on a job.
Lap Siding
Panel
Trim
Soffit
Backerboard + Underlayment
Multishake
www.AlluraUSA.com
www.facebook.com/AlluraUSA
www.twitter.com/AlluraUSA
© 2/15 Plycem USA LLC, Printed in U.S.A
A1502-UBII-4p4/1
AlluraUSA.com